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Natural HistoryMammals - LargeGrizzly Bear - Ursus arctos horribilisProfiles
Lurid Details
Sense of Life - Continued

Sense of Life

Page 2 of 7


  • Most recent carnivore to evolve (Ursidae): 40 million years
  • Distant cousin of dogs (Canidae)

Size (Adult Male Grizzly in Montana)photo: Three grizzlies with bison carcass, linked to enlargement of photo
  • Length, 8 feet
  • Average weight, 350 to 700 pounds
  • Forepaws 5 feet long, 6 feet wide; hind paws 10 feet long, 6 feet wide; claws, 4 feet
  • Hump is a mass of muscles for power digging, striking with forepaws

  • Possibly equal to human vision
  • Nearsighted, to see food at ground level
  • Eyes directed forward; doesn't need to worry about predators
  • Can distinguish colors, though do not see them as humans do
  • Good peripheral vision

  • Fair to moderately good (for a wild animal)
  • Far more sensitive than human hearing, in order to locate movements of rodents underground
  • Can hear human conversation from 300 meters (that's 328 yards, or more than 3 football fields away)

--Joseph Mussulman; reviewed by Charles Jonkel

Lurid Details
Sense of Life - Continued

From Discovering Lewis & Clark ®, http://www.lewis-clark.org © 1998-2014
by The Lewis and Clark Fort Mandan Foundation, Washburn, North Dakota.
Journal excerpts are from The Journals of the Lewis and Clark Expedition, edited by Gary E. Moulton
13 vols. (Lincoln: University of Nebraska Press, 1983-2001)